This project aims to control a robot using a MEMS sensor. The MEMS sensor will be attached to a hand and detect mechanical movements, converting them into electrical signals representing coordinates. These signals will be sent to a microcontroller via I2C protocol and used to control two DC motors on the robot model through an L293D driver IC. The robot's direction will change based on hand movements. The hardware includes an AT89x microcontroller, MEMS sensor, motors, and power supply components like a step-down transformer, filter, and 7805 regulator.

1. Head office Buildings, OP: 3nd floor, Krishna Reddy P: ICICI ATM, Ramalingapuram, Nellore
www.pvrtechnology.com, E-Mail: pvrieeeprojects@gmail.com, Ph: 81432 71457
MEMS BASED ROBO CONTROL
DESCRIPTION:
Micro electro mechanical systems (MEMS) (also written as micro-electro-mechanical,
MicroElectroMechanical or microelectronic and microelectromechanical systems) is the
technology of very small mechanical devices driven by electricity and it merges at the nano scale
into nanoelectromechanical systems (NEMS) and nanotechnology.
MEMS are separate and distinct from the hypothetical vision of molecular
nanotechnology or molecular electronics. MEMS are made up of components between 1 to 100
micrometres in size (i.e. 0.001 to 0.1 mm) and MEMS devices generally range in size from 20
micrometres (20 millionths of a meter) to a millimeter. They usually consist of a central unit that
processes data, the microprocessor and several components that interact with the outside such as
micro sensors. This MEMS works on i2c protocol and having SDA, SCL pins. Here
microcontroller acts as master and MEMS acts as a slave.
The aim of this project is to control the Robot using MEMS. The MEMS will be tagged
to the hand. Whenever the hand moves in a particular direction, the mechanical movement of the
hand will be recognized by MEMS. MEMS convert this mechanical hand movement into
equivalent electrical signals(X, Y, Z coordinates) and send it to the microcontroller. The
communication between microcontroller and MEMS takes place based on i2c protocol. In this
protocol microcontroller acts as a master and MEMS acts as a Slave. And here a model for robot
will be designed by using 2 dc motors, these two motors will be interfaced to the controller
through a driver IC L293D. This robot’s direction will be controlled based on the signals
received by the MEMS, as per the code logic.
This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for
relay. 7805 three terminal voltage regulator is used for voltage regulation. Full wave bridge
rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

2. Head office Buildings, OP: 3nd floor, Krishna Reddy P: ICICI ATM, Ramalingapuram, Nellore
www.pvrtechnology.com, E-Mail: pvrieeeprojects@gmail.com, Ph: 81432 71457
TECHNICAL SPECIFICATIONS:
HARDWARE:
Micro controller : AT89x series
Crystal : 11.0592 MHz
MEMS sensor
Driver IC : L293D
DC motors
Power supply
Transformer : 12V step down
Filter : 1000uf/25V
Voltage Regulator : 7805, 7812
SOFTWARE:
Keil IDE
UC flash
Proteus
APPLICATIONS
 Industrial applications
 Automatic control systems

3. Head office Buildings, OP: 3nd floor, Krishna Reddy P: ICICI ATM, Ramalingapuram, Nellore
www.pvrtechnology.com, E-Mail: pvrieeeprojects@gmail.com, Ph: 81432 71457
BLOCK DIAGRAM:
POWER SUPPLY BLOCK DIAGRAM:
Power
Supply 8
0
5
1
L293D
Motor1
MEMS
sensor
Motor2
Stepdown
Transformer
Filter Regulator OutputBridge
Rectifier

4. Head office Buildings, OP: 3nd floor, Krishna Reddy P: ICICI ATM, Ramalingapuram, Nellore
www.pvrtechnology.com, E-Mail: pvrieeeprojects@gmail.com, Ph: 81432 71457